The Shrinking Brain: Shrews' Secret to Surviving Winter
The Eurasian common shrew, Sorex araneus, is a small mammal that has a unique way of dealing with winter. Instead of hibernating or migrating, it shrinks its brain, skull, and most organs. Then, come spring, it grows back to its original size. This ability to change brain size is something that scientists are still trying to understand. The shrew's hypothalamus is a...